ENCODING METHOD, DECODING METHOD, ENCODING DEVICE AND DECODING DEVICE

摘要

A coding method according to an implementation of the present invention includes: transforming an input signal using a first transform coefficient (S110); transforming, using a second transform coefficient, a first partial signal that is a part of the first transformed output signal (S130b); quantizing the second transformed output signal and a second partial signal that is a part of the first transformed output signal other than the first partial signal (S150b); and entropy coding the quantized coefficient (S160), and the transforming of a first partial signal (S130b) includes: modifying the first partial signal or the second transform coefficient using a predetermined scaling parameter to generate a modified first partial signal or a modified second transform coefficient (S131); and generating the second transformed output signal (S132) by transforming the modified first partial signal using the second transform coefficient or transforming the first partial signal using the modified second transform coefficient.